1 /* 2 * GHES/EDAC Linux driver 3 * 4 * This file may be distributed under the terms of the GNU General Public 5 * License version 2. 6 * 7 * Copyright (c) 2013 by Mauro Carvalho Chehab 8 * 9 * Red Hat Inc. http://www.redhat.com 10 */ 11 12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 13 14 #include <acpi/ghes.h> 15 #include <linux/edac.h> 16 #include <linux/dmi.h> 17 #include "edac_core.h" 18 #include <ras/ras_event.h> 19 20 #define GHES_EDAC_REVISION " Ver: 1.0.0" 21 22 struct ghes_edac_pvt { 23 struct list_head list; 24 struct ghes *ghes; 25 struct mem_ctl_info *mci; 26 27 /* Buffers for the error handling routine */ 28 char detail_location[240]; 29 char other_detail[160]; 30 char msg[80]; 31 }; 32 33 static LIST_HEAD(ghes_reglist); 34 static DEFINE_MUTEX(ghes_edac_lock); 35 static int ghes_edac_mc_num; 36 37 38 /* Memory Device - Type 17 of SMBIOS spec */ 39 struct memdev_dmi_entry { 40 u8 type; 41 u8 length; 42 u16 handle; 43 u16 phys_mem_array_handle; 44 u16 mem_err_info_handle; 45 u16 total_width; 46 u16 data_width; 47 u16 size; 48 u8 form_factor; 49 u8 device_set; 50 u8 device_locator; 51 u8 bank_locator; 52 u8 memory_type; 53 u16 type_detail; 54 u16 speed; 55 u8 manufacturer; 56 u8 serial_number; 57 u8 asset_tag; 58 u8 part_number; 59 u8 attributes; 60 u32 extended_size; 61 u16 conf_mem_clk_speed; 62 } __attribute__((__packed__)); 63 64 struct ghes_edac_dimm_fill { 65 struct mem_ctl_info *mci; 66 unsigned count; 67 }; 68 69 static void ghes_edac_count_dimms(const struct dmi_header *dh, void *arg) 70 { 71 int *num_dimm = arg; 72 73 if (dh->type == DMI_ENTRY_MEM_DEVICE) 74 (*num_dimm)++; 75 } 76 77 static void ghes_edac_dmidecode(const struct dmi_header *dh, void *arg) 78 { 79 struct ghes_edac_dimm_fill *dimm_fill = arg; 80 struct mem_ctl_info *mci = dimm_fill->mci; 81 82 if (dh->type == DMI_ENTRY_MEM_DEVICE) { 83 struct memdev_dmi_entry *entry = (struct memdev_dmi_entry *)dh; 84 struct dimm_info *dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms, 85 mci->n_layers, 86 dimm_fill->count, 0, 0); 87 88 if (entry->size == 0xffff) { 89 pr_info("Can't get DIMM%i size\n", 90 dimm_fill->count); 91 dimm->nr_pages = MiB_TO_PAGES(32);/* Unknown */ 92 } else if (entry->size == 0x7fff) { 93 dimm->nr_pages = MiB_TO_PAGES(entry->extended_size); 94 } else { 95 if (entry->size & 1 << 15) 96 dimm->nr_pages = MiB_TO_PAGES((entry->size & 97 0x7fff) << 10); 98 else 99 dimm->nr_pages = MiB_TO_PAGES(entry->size); 100 } 101 102 switch (entry->memory_type) { 103 case 0x12: 104 if (entry->type_detail & 1 << 13) 105 dimm->mtype = MEM_RDDR; 106 else 107 dimm->mtype = MEM_DDR; 108 break; 109 case 0x13: 110 if (entry->type_detail & 1 << 13) 111 dimm->mtype = MEM_RDDR2; 112 else 113 dimm->mtype = MEM_DDR2; 114 break; 115 case 0x14: 116 dimm->mtype = MEM_FB_DDR2; 117 break; 118 case 0x18: 119 if (entry->type_detail & 1 << 13) 120 dimm->mtype = MEM_RDDR3; 121 else 122 dimm->mtype = MEM_DDR3; 123 break; 124 default: 125 if (entry->type_detail & 1 << 6) 126 dimm->mtype = MEM_RMBS; 127 else if ((entry->type_detail & ((1 << 7) | (1 << 13))) 128 == ((1 << 7) | (1 << 13))) 129 dimm->mtype = MEM_RDR; 130 else if (entry->type_detail & 1 << 7) 131 dimm->mtype = MEM_SDR; 132 else if (entry->type_detail & 1 << 9) 133 dimm->mtype = MEM_EDO; 134 else 135 dimm->mtype = MEM_UNKNOWN; 136 } 137 138 /* 139 * Actually, we can only detect if the memory has bits for 140 * checksum or not 141 */ 142 if (entry->total_width == entry->data_width) 143 dimm->edac_mode = EDAC_NONE; 144 else 145 dimm->edac_mode = EDAC_SECDED; 146 147 dimm->dtype = DEV_UNKNOWN; 148 dimm->grain = 128; /* Likely, worse case */ 149 150 /* 151 * FIXME: It shouldn't be hard to also fill the DIMM labels 152 */ 153 154 if (dimm->nr_pages) { 155 edac_dbg(1, "DIMM%i: %s size = %d MB%s\n", 156 dimm_fill->count, edac_mem_types[dimm->mtype], 157 PAGES_TO_MiB(dimm->nr_pages), 158 (dimm->edac_mode != EDAC_NONE) ? "(ECC)" : ""); 159 edac_dbg(2, "\ttype %d, detail 0x%02x, width %d(total %d)\n", 160 entry->memory_type, entry->type_detail, 161 entry->total_width, entry->data_width); 162 } 163 164 dimm_fill->count++; 165 } 166 } 167 168 void ghes_edac_report_mem_error(struct ghes *ghes, int sev, 169 struct cper_sec_mem_err *mem_err) 170 { 171 enum hw_event_mc_err_type type; 172 struct edac_raw_error_desc *e; 173 struct mem_ctl_info *mci; 174 struct ghes_edac_pvt *pvt = NULL; 175 char *p; 176 u8 grain_bits; 177 178 list_for_each_entry(pvt, &ghes_reglist, list) { 179 if (ghes == pvt->ghes) 180 break; 181 } 182 if (!pvt) { 183 pr_err("Internal error: Can't find EDAC structure\n"); 184 return; 185 } 186 mci = pvt->mci; 187 e = &mci->error_desc; 188 189 /* Cleans the error report buffer */ 190 memset(e, 0, sizeof (*e)); 191 e->error_count = 1; 192 strcpy(e->label, "unknown label"); 193 e->msg = pvt->msg; 194 e->other_detail = pvt->other_detail; 195 e->top_layer = -1; 196 e->mid_layer = -1; 197 e->low_layer = -1; 198 *pvt->other_detail = '\0'; 199 *pvt->msg = '\0'; 200 201 switch (sev) { 202 case GHES_SEV_CORRECTED: 203 type = HW_EVENT_ERR_CORRECTED; 204 break; 205 case GHES_SEV_RECOVERABLE: 206 type = HW_EVENT_ERR_UNCORRECTED; 207 break; 208 case GHES_SEV_PANIC: 209 type = HW_EVENT_ERR_FATAL; 210 break; 211 default: 212 case GHES_SEV_NO: 213 type = HW_EVENT_ERR_INFO; 214 } 215 216 edac_dbg(1, "error validation_bits: 0x%08llx\n", 217 (long long)mem_err->validation_bits); 218 219 /* Error type, mapped on e->msg */ 220 if (mem_err->validation_bits & CPER_MEM_VALID_ERROR_TYPE) { 221 p = pvt->msg; 222 switch (mem_err->error_type) { 223 case 0: 224 p += sprintf(p, "Unknown"); 225 break; 226 case 1: 227 p += sprintf(p, "No error"); 228 break; 229 case 2: 230 p += sprintf(p, "Single-bit ECC"); 231 break; 232 case 3: 233 p += sprintf(p, "Multi-bit ECC"); 234 break; 235 case 4: 236 p += sprintf(p, "Single-symbol ChipKill ECC"); 237 break; 238 case 5: 239 p += sprintf(p, "Multi-symbol ChipKill ECC"); 240 break; 241 case 6: 242 p += sprintf(p, "Master abort"); 243 break; 244 case 7: 245 p += sprintf(p, "Target abort"); 246 break; 247 case 8: 248 p += sprintf(p, "Parity Error"); 249 break; 250 case 9: 251 p += sprintf(p, "Watchdog timeout"); 252 break; 253 case 10: 254 p += sprintf(p, "Invalid address"); 255 break; 256 case 11: 257 p += sprintf(p, "Mirror Broken"); 258 break; 259 case 12: 260 p += sprintf(p, "Memory Sparing"); 261 break; 262 case 13: 263 p += sprintf(p, "Scrub corrected error"); 264 break; 265 case 14: 266 p += sprintf(p, "Scrub uncorrected error"); 267 break; 268 case 15: 269 p += sprintf(p, "Physical Memory Map-out event"); 270 break; 271 default: 272 p += sprintf(p, "reserved error (%d)", 273 mem_err->error_type); 274 } 275 } else { 276 strcpy(pvt->msg, "unknown error"); 277 } 278 279 /* Error address */ 280 if (mem_err->validation_bits & CPER_MEM_VALID_PA) { 281 e->page_frame_number = mem_err->physical_addr >> PAGE_SHIFT; 282 e->offset_in_page = mem_err->physical_addr & ~PAGE_MASK; 283 } 284 285 /* Error grain */ 286 if (mem_err->validation_bits & CPER_MEM_VALID_PA_MASK) 287 e->grain = ~(mem_err->physical_addr_mask & ~PAGE_MASK); 288 289 /* Memory error location, mapped on e->location */ 290 p = e->location; 291 if (mem_err->validation_bits & CPER_MEM_VALID_NODE) 292 p += sprintf(p, "node:%d ", mem_err->node); 293 if (mem_err->validation_bits & CPER_MEM_VALID_CARD) 294 p += sprintf(p, "card:%d ", mem_err->card); 295 if (mem_err->validation_bits & CPER_MEM_VALID_MODULE) 296 p += sprintf(p, "module:%d ", mem_err->module); 297 if (mem_err->validation_bits & CPER_MEM_VALID_RANK_NUMBER) 298 p += sprintf(p, "rank:%d ", mem_err->rank); 299 if (mem_err->validation_bits & CPER_MEM_VALID_BANK) 300 p += sprintf(p, "bank:%d ", mem_err->bank); 301 if (mem_err->validation_bits & CPER_MEM_VALID_ROW) 302 p += sprintf(p, "row:%d ", mem_err->row); 303 if (mem_err->validation_bits & CPER_MEM_VALID_COLUMN) 304 p += sprintf(p, "col:%d ", mem_err->column); 305 if (mem_err->validation_bits & CPER_MEM_VALID_BIT_POSITION) 306 p += sprintf(p, "bit_pos:%d ", mem_err->bit_pos); 307 if (mem_err->validation_bits & CPER_MEM_VALID_MODULE_HANDLE) { 308 const char *bank = NULL, *device = NULL; 309 dmi_memdev_name(mem_err->mem_dev_handle, &bank, &device); 310 if (bank != NULL && device != NULL) 311 p += sprintf(p, "DIMM location:%s %s ", bank, device); 312 else 313 p += sprintf(p, "DIMM DMI handle: 0x%.4x ", 314 mem_err->mem_dev_handle); 315 } 316 if (p > e->location) 317 *(p - 1) = '\0'; 318 319 /* All other fields are mapped on e->other_detail */ 320 p = pvt->other_detail; 321 if (mem_err->validation_bits & CPER_MEM_VALID_ERROR_STATUS) { 322 u64 status = mem_err->error_status; 323 324 p += sprintf(p, "status(0x%016llx): ", (long long)status); 325 switch ((status >> 8) & 0xff) { 326 case 1: 327 p += sprintf(p, "Error detected internal to the component "); 328 break; 329 case 16: 330 p += sprintf(p, "Error detected in the bus "); 331 break; 332 case 4: 333 p += sprintf(p, "Storage error in DRAM memory "); 334 break; 335 case 5: 336 p += sprintf(p, "Storage error in TLB "); 337 break; 338 case 6: 339 p += sprintf(p, "Storage error in cache "); 340 break; 341 case 7: 342 p += sprintf(p, "Error in one or more functional units "); 343 break; 344 case 8: 345 p += sprintf(p, "component failed self test "); 346 break; 347 case 9: 348 p += sprintf(p, "Overflow or undervalue of internal queue "); 349 break; 350 case 17: 351 p += sprintf(p, "Virtual address not found on IO-TLB or IO-PDIR "); 352 break; 353 case 18: 354 p += sprintf(p, "Improper access error "); 355 break; 356 case 19: 357 p += sprintf(p, "Access to a memory address which is not mapped to any component "); 358 break; 359 case 20: 360 p += sprintf(p, "Loss of Lockstep "); 361 break; 362 case 21: 363 p += sprintf(p, "Response not associated with a request "); 364 break; 365 case 22: 366 p += sprintf(p, "Bus parity error - must also set the A, C, or D Bits "); 367 break; 368 case 23: 369 p += sprintf(p, "Detection of a PATH_ERROR "); 370 break; 371 case 25: 372 p += sprintf(p, "Bus operation timeout "); 373 break; 374 case 26: 375 p += sprintf(p, "A read was issued to data that has been poisoned "); 376 break; 377 default: 378 p += sprintf(p, "reserved "); 379 break; 380 } 381 } 382 if (mem_err->validation_bits & CPER_MEM_VALID_REQUESTOR_ID) 383 p += sprintf(p, "requestorID: 0x%016llx ", 384 (long long)mem_err->requestor_id); 385 if (mem_err->validation_bits & CPER_MEM_VALID_RESPONDER_ID) 386 p += sprintf(p, "responderID: 0x%016llx ", 387 (long long)mem_err->responder_id); 388 if (mem_err->validation_bits & CPER_MEM_VALID_TARGET_ID) 389 p += sprintf(p, "targetID: 0x%016llx ", 390 (long long)mem_err->responder_id); 391 if (p > pvt->other_detail) 392 *(p - 1) = '\0'; 393 394 /* Generate the trace event */ 395 grain_bits = fls_long(e->grain); 396 snprintf(pvt->detail_location, sizeof(pvt->detail_location), 397 "APEI location: %s %s", e->location, e->other_detail); 398 trace_mc_event(type, e->msg, e->label, e->error_count, 399 mci->mc_idx, e->top_layer, e->mid_layer, e->low_layer, 400 (e->page_frame_number << PAGE_SHIFT) | e->offset_in_page, 401 grain_bits, e->syndrome, pvt->detail_location); 402 403 /* Report the error via EDAC API */ 404 edac_raw_mc_handle_error(type, mci, e); 405 } 406 EXPORT_SYMBOL_GPL(ghes_edac_report_mem_error); 407 408 int ghes_edac_register(struct ghes *ghes, struct device *dev) 409 { 410 bool fake = false; 411 int rc, num_dimm = 0; 412 struct mem_ctl_info *mci; 413 struct edac_mc_layer layers[1]; 414 struct ghes_edac_pvt *pvt; 415 struct ghes_edac_dimm_fill dimm_fill; 416 417 /* Get the number of DIMMs */ 418 dmi_walk(ghes_edac_count_dimms, &num_dimm); 419 420 /* Check if we've got a bogus BIOS */ 421 if (num_dimm == 0) { 422 fake = true; 423 num_dimm = 1; 424 } 425 426 layers[0].type = EDAC_MC_LAYER_ALL_MEM; 427 layers[0].size = num_dimm; 428 layers[0].is_virt_csrow = true; 429 430 /* 431 * We need to serialize edac_mc_alloc() and edac_mc_add_mc(), 432 * to avoid duplicated memory controller numbers 433 */ 434 mutex_lock(&ghes_edac_lock); 435 mci = edac_mc_alloc(ghes_edac_mc_num, ARRAY_SIZE(layers), layers, 436 sizeof(*pvt)); 437 if (!mci) { 438 pr_info("Can't allocate memory for EDAC data\n"); 439 mutex_unlock(&ghes_edac_lock); 440 return -ENOMEM; 441 } 442 443 pvt = mci->pvt_info; 444 memset(pvt, 0, sizeof(*pvt)); 445 list_add_tail(&pvt->list, &ghes_reglist); 446 pvt->ghes = ghes; 447 pvt->mci = mci; 448 mci->pdev = dev; 449 450 mci->mtype_cap = MEM_FLAG_EMPTY; 451 mci->edac_ctl_cap = EDAC_FLAG_NONE; 452 mci->edac_cap = EDAC_FLAG_NONE; 453 mci->mod_name = "ghes_edac.c"; 454 mci->mod_ver = GHES_EDAC_REVISION; 455 mci->ctl_name = "ghes_edac"; 456 mci->dev_name = "ghes"; 457 458 if (!ghes_edac_mc_num) { 459 if (!fake) { 460 pr_info("This EDAC driver relies on BIOS to enumerate memory and get error reports.\n"); 461 pr_info("Unfortunately, not all BIOSes reflect the memory layout correctly.\n"); 462 pr_info("So, the end result of using this driver varies from vendor to vendor.\n"); 463 pr_info("If you find incorrect reports, please contact your hardware vendor\n"); 464 pr_info("to correct its BIOS.\n"); 465 pr_info("This system has %d DIMM sockets.\n", 466 num_dimm); 467 } else { 468 pr_info("This system has a very crappy BIOS: It doesn't even list the DIMMS.\n"); 469 pr_info("Its SMBIOS info is wrong. It is doubtful that the error report would\n"); 470 pr_info("work on such system. Use this driver with caution\n"); 471 } 472 } 473 474 if (!fake) { 475 /* 476 * Fill DIMM info from DMI for the memory controller #0 477 * 478 * Keep it in blank for the other memory controllers, as 479 * there's no reliable way to properly credit each DIMM to 480 * the memory controller, as different BIOSes fill the 481 * DMI bank location fields on different ways 482 */ 483 if (!ghes_edac_mc_num) { 484 dimm_fill.count = 0; 485 dimm_fill.mci = mci; 486 dmi_walk(ghes_edac_dmidecode, &dimm_fill); 487 } 488 } else { 489 struct dimm_info *dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms, 490 mci->n_layers, 0, 0, 0); 491 492 dimm->nr_pages = 1; 493 dimm->grain = 128; 494 dimm->mtype = MEM_UNKNOWN; 495 dimm->dtype = DEV_UNKNOWN; 496 dimm->edac_mode = EDAC_SECDED; 497 } 498 499 rc = edac_mc_add_mc(mci); 500 if (rc < 0) { 501 pr_info("Can't register at EDAC core\n"); 502 edac_mc_free(mci); 503 mutex_unlock(&ghes_edac_lock); 504 return -ENODEV; 505 } 506 507 ghes_edac_mc_num++; 508 mutex_unlock(&ghes_edac_lock); 509 return 0; 510 } 511 EXPORT_SYMBOL_GPL(ghes_edac_register); 512 513 void ghes_edac_unregister(struct ghes *ghes) 514 { 515 struct mem_ctl_info *mci; 516 struct ghes_edac_pvt *pvt, *tmp; 517 518 list_for_each_entry_safe(pvt, tmp, &ghes_reglist, list) { 519 if (ghes == pvt->ghes) { 520 mci = pvt->mci; 521 edac_mc_del_mc(mci->pdev); 522 edac_mc_free(mci); 523 list_del(&pvt->list); 524 } 525 } 526 } 527 EXPORT_SYMBOL_GPL(ghes_edac_unregister); 528